endotherm

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endotherm

[′en·də‚thərm]
(physical chemistry)
In differential thermal analysis, a graph of the temperature difference between a sample compound and a thermally inert reference compound (commonly aluminum oxide) as the substances are simultaneously heated to elevated temperatures at a predetermined rate, and the sample compound undergoes endothermal or exothermal processes.
(physiology)
An animal that produces enough heat from its own metabolism and employs devices to retard heat loss so that it is able to keep its body temperature higher than that of its environment.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Melt endotherms of PP/f-MWNT master batch through various self-seeding thermal cycles (a).
The following variables were considered: system type (freshwater, marine, or terrestrial), species richness, the number of food chain paths (FCPs), mean food chain length (MFCL), the relative proportion of endotherms at the herbivore level, maximum food chain length (FCL), connectance, linkage density, average diet breadth, average prey vulnerability, average body size at the autotroph, herbivore and apex predator positions, and the difference between predator-prey body size at the herbivore and apex predator positions.
Thermoanalysis of the terpolyester by DSC revealed a glass transition temperature [T.sub.g] of 2.5[degrees]C, a cold crystallization point [T.sub.c] at 64.3[degrees]C, and two melting endotherms [T.sub.m1] and [T.sub.m2] at 122.4 and 137.1[degrees]C.
According to Bergmann's rule, endotherm (warm blooded) vertebrates living in cooler climates tend to be larger than members of the same genus in warmer climates.
Exotherms are characterized by the presence of two crystallization peaks at 61-62 [degrees]C and 98 [degrees]C, whereas the endotherm has only one broad melting peak at 110-111 [degrees]C.
In figure 3b, the lower ethylene content copolymer exhibits a prominent melting peak at ~98[degrees]C, corresponding to primary crystallites, and a weak endotherm at ~50[degrees]C, corresponding to secondary crystallites.
The differences between ectotherms and endotherms diminish as size increases, because of the simple fact that a body with a large mass maintains a very constant temperature.
In summary, contrary to endotherms where the fitness consequences of body size and shape on heat loss are believed to have resulted in geographic patterns known as Bergmann's and Allen's rules, many ectothermic organisms display a pattern of body-size variation referred to as the converse of Bergmann's Rule (Masaki 1978) that is thought to have evolved in response to geographic patterns in season length.
However, even endotherms may hibernate or overwinter in refugia (as T.
Notably, the Australian example involves a large ectothermic predator rather than endotherms as in Africa.
8, the melting endotherms of virgin PET and PET extruded with 1,3-PBO with concentrations from 0 to 2.0 wt% are shown.